ping - Shields Up says it does but it don't

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http://forums.fedoraforum.org – My ISP (Insight if you know them) says I had open ports. OK I did! Shame on me! I'll blame my $15.00 router but I know it's my fault. OK took care of that. But when I run Shields Up from grc.com it keeps telling me it can ping (IMCP) me. I tried to get the firewall to stop, or drop the ping and it seems to on my local network, I can't ping my my boxes locally and I can't even ping my router. But Shields Up keeps telling me it can ping me. Any one know how I can see what's sending the ping, or I guess they call it the pong, back to echo the ping? Thanks, Pat Jr. (HowTos)